Energy response pattern on bearing components of steel frames under various intensity measures

This study, explores the seismic energy response and distribution patterns in steel moment-resisting frames of varying heights using a fiber-based nonlinear dynamic analysis. By employing ۴۴ ground motion records at the design basis earthquake (DBE) level, the energy demands of ۲, ۴, and ۲۰ story frames were evaluated to understand how structural height affects energy dissipation mechanisms. A modified opensees framework was used to calculate key energy parameters, ensuring accurate energy balance validation. The results demonstrate a clear shift in energy absorption from columns to beams as building height increases. In low-rise frames, energy dissipation is predominantly concentrated in the columns through hysteretic behavior, reflecting a stiff structural response. In contrast, high-rise frames exhibit greater flexibility, with energy dissipation primarily occurring in the beams. The results revealed that damping energy plays an increasingly significant role with height, while kinetic energy contributions remain minimal across all models. The findings emphasize the importance of height-dependent considerations in energy-based seismic design (EBSD) and performance assessment of steel structures, highlighting the need for design strategies to optimize energy dissipation paths for different structural configurations.

کلیدواژه ها:

Energy balance ، Energy based design ، Steel moment frame ، Nonlinear time history analysis ، Fiber material